Fire extinguisher



Dcl. 29,1925. 1,567,959 F. E. KRAuss FIRE EXTINGUI SHER Filed May 4, 1923 Patented Dec. 29, 1925.

PATENT OFFICE.

FRIEDRICH EIIL KRATl'SS, OF SCHWARZENBEBG, GERMANY.

FIRE EXTINGUISHER.

Application medley 4, 1923. Serial No. 636,749.

To all whom it ma concern:

Be it known t at I, FRIEDRICH Earn.

KRAUss, a citizen of the German Republic,

tinguishers which work with an extinction liquid and pressure cartridge. For such extinguishers it is necessary that reserve charges should be kept at hand or despatched and stored. Pressure cartridges consist of opaque material, almost always of metal. If such a reserve cartridge is inserted, it is never certain that the pressure has not escaped owing to porosity, rusting, external damage and the like and the extinguisher fails to act when wanted. l

The object of this invention is to avoid this drawback. This object is attained by storing the pressure cartridge within the liquid of the reserve bottle and preferably providing means'for indicating the escape of the pressure.

The drawing illustrates in longitudinal section an embodiment of my invention.

Referring to the drawing a is the receptacle for containing the reserve charge for an extinguisher and has a filling opening at its top providedwith an internally threaded neck 6. The cylindrical cartridge (Z is inserted through the opening of the container and is threaded at its upper end for engaging neck e. The cap I) of the cartridge (Z is adapted to compress washer f against the top of neck 6 for the purpose of making an air-tight closure.

A further development of the invention is the provision of a burst or excess pressure 40 valve, which either indicates the excess pressure in the manner of a small pressure gauge or allows it to'escape into the enclosing liquid or without the same in accordance with the position of the valve.

A simple construction of this nature is shown. As a valve a soldered lead disk 1' is chosen, which is made so thin that it is torn, if the excess pressure escapes from the cartridge into the vessel and the compressed air escapes together with the liquid, as the liquid is useless, if the cartridge is no longer charged. By altering the diameter and the thickness of the soldered plate the arrangement may be such that low pressure passing into the container is not capable of destroying the safety disk, but only the full pressure.

Other modifications will easily suggest themselves.

What I claim as my invention and desire to secure by Letters Patent is A reserve charge receptacle for fire 'extinguishers, comprising a closed container having a screw-threaded filling opening for the extinction liquid, a pressure cartridge insertable in said opening and having a screw-threaded head for cooperating therewith and forming the closure therefor, and a safety blow-off in a wall of the container positioned to drain the container on the occurrence of a predetermined pressure therein, as described.

In testimony whereof I afiix my signature.

' FRIEDRICH EMIL KRAUSS. 

